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High temperature properties of MIM processed superalloys
Technical Paper: PIM International, Vol.4 No.4 December 2010, pages 63-67, 1364 words
[1] Fraunhofer IFAM Dresden, Winterbergstr. 28, 01277 Dresden, Germany
[2] Schunk Sintermetalltechnik GmbH, Roßtrappenstr. 62, 06502 Thale, Germany
Abstract
Two Ni-based PM superalloys (Inconel 713C & Udimet 720), which have been processed by metal injection moulding (MIM), were analysed with respect to their high-temperature properties. This included tensile tests at temperatures up to 900°C and evaluation of oxidation resistance up to 1100°C.
The first test series lead to promising results when compared to other processing routes; however, optimisations concerning impurity contents are necessary to improve the high-temperature performance.
Introduction
There is a continuous demand for shifting the operating temperatures to higher values, especially in the automotive and aircraft industry, combined with the need for cost-effective mass production of the respective parts. With respect to suitable high-temperature materials, these are subject to complex thermomechanical loads at service temperatures.
One of the most promising material classes to fulfil all the requirements are Ni-based superalloys, which have been focused on in R&D as well as in production of the respective parts for many years due to their excellent combination of mechanical strength and corrosion resistance.
Regarding cost-effective production routes, the metal injection moulding (MIM) process offers an advantageous route for production of large numbers of near-net-shape parts. Therefore, MIM-processed superalloys are one of the most promising candidates for next-generation parts in high-temperature applications.
There is knowledge available on how to process superalloys by MIM and their room-temperature properties [1, 2]. However, in order get a more profound understanding on how these MIM-processed alloys are going to perform at temperatures in the range of actual service conditions, their high-temperature properties need to be analysed. This study has the aim of providing first results for selected alloys. .........
Further sections of this paper include:
- Experimental
- Results and discussion
- Density & impurity contents
- Hot tensile test
- Oxidation resistance - Conclusions
- References
Figures and Tables:
Fig. 1 (a) MIM tensile bars, (b) MIM tensile bar, machined for HT testing, (c) MIM tensile bar after HT mechanical test (tensile test)Fig. 2 Typical stress-strain curves at elevated temperatures for alloys of this study
Fig. 3 Element distribution (Ti, Cr, Nb, Mo) in MIM sample of alloy IN713C (condition as sintered)
Fig. 4 Element distribution (Ti, Cr, Mo) in MIM sample of alloy U720 (condition as sintered)
Fig. 5 Element distribution in alloy IN 713C after isothermal oxidation (900°C, 100h, air)
Fig. 6 Element distribution in alloy IN 713C after isothermal oxidation (1000°C, 100h, air)
Fig. 7 Element distribution in alloy IN 713C after isothermal oxidation (1100°C, 100h, air)
Fig. 8 SEM images of alloy IN 713C after oxidation for 100h at different temperatures
Table 1 Typical chemical composition of studied superalloys (wt%)
Table 2 Post-processing of studied alloys
Table 3 Impurity contents (carbon (C), nitrogen (N) and oxygen (O)) for MIM samples in the as-sintered condition; values from literature are given for comparison
Table 4 Tensile properties of MIM-processed alloys Inconel 713C & Udimet 720 at elevated temperature; values from literature are given for comparison
Table 5 High-temperature tensile properties of alloy Udimet 720 at temperatures other than those investigated in this study
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